python - 为什么用requests库能爬取而用scrapy却不能?

问题描述

# -*- coding: utf-8 -*-import requestsdef xici_request(): url = ’http://www.xicidaili.com’ headers = {’Accept’: ’text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8’,’Accept-Encoding’: ’gzip, deflate, sdch’,’Accept-Language’: ’zh-CN,zh;q=0.8’,’Cache-Control’: ’max-age=0’,’Connection’: ’keep-alive’,’Host’: ’www.xicidaili.com’,’Referer’: ’https://www.google.com/’,’User-Agent’: ’Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36’ res = requests.get(url, headers=headers) print(res.text)if __name__ == ’__main__’: xici_request()

# -*- coding: utf-8 -*-import scrapyfrom collectips.items import CollectipsItemclass XiciSpider(scrapy.Spider): name = 'xici' allowed_domains = ['http://www.xicidaili.com'] headers = {’Accept’: ’text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8’, ’Accept-Encoding’: ’gzip, deflate, sdch’, ’Accept-Language’: ’zh-CN,zh;q=0.8’, ’Cache-Control’: ’max-age=0’, ’Connection’: ’keep-alive’, ’Host’: ’www.xicidaili.com’, ’Referer’: ’https://www.google.com/’, ’User-Agent’: ’Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36’} def start_requests(self):reqs = []for i in range(1, 21): req = scrapy.Request(’http://www.xicidaili.com/nn/{}’.format(i), headers=self.headers) reqs.append(req)return reqs def parse(self, response):item = CollectipsItem()sel = response.selectorfor i in range(2, 102): item[’IP’] = sel.xpath(’//*[@id='ip_list']/tbody/tr[{}]/td[2]/text()’.format(i)).extract() item[’PORT’] = sel.xpath(’//*[@id='ip_list']/tbody/tr[{}]/td[3]/text()’.format(i)).extract() item[’DNS_POSITION’] = sel.xpath(’//*[@id='ip_list']/tbody/tr[{}]/td[4]/a/text()’.format(i)).extract() item[’TYPE’] = sel.xpath(’//*[@id='ip_list']/tbody/tr[{}]/td[6]/text()’.format(i)).extract() item[’SPEED’] = sel.xpath(’//*[@id='ip_list']/tbody/tr[{}]/td[7]/p[@title]’.format(i)).extract() item[’LAST_CHECK_TIME’] = sel.xpath(’//*[@id='ip_list']/tbody/tr[{}]/td[10]/text()’.format(i)).extract() yield item

代码如上,为什么requests能返回网页内容,而scrapy却是报错内部服务器错误500? 请大神解救??

问题解答

并发你没考虑进去吧，当同一时间发起过多的请求会直接封你IP